Mysterious Floor Hole

[lornaschinske]

Only hole in our floor (also covered by a metal plate that is screwed down) is the access hole to the top of the fuel tank. Gives access to the fuel level sending unit.

[somewhereinusa]

Fuel sending unit is what tells how much fuel you have. If there is an access hole, you won't be able to get at it any other way other than removing the fuel tank. If that is what it is you haven't gotten everything off yet. You should be able to see the top of the tank. Sending unit is usually round with some screws holding it to tank with one wire going to it.

[Stuff]

yup looks like the fuel level sending unit to me.

[lornaschinske]

Make sure you can access this hole later. I've already pulled our brass float out of the fuel tank and soldered a hole closed in it (now it works). Ours was pretty filthy too (I used an old paint brush that we use as a dust brush to clean off the top of the tank. Unfortunately, a base cabinet in the galley will cover our access panel so I have to remember to make the cabinet to where I can pull it out at a later date if need be. The cabinet is my 10" wide can rotator so the bottom of the cabinet will be inaccessible.

[Diesel Dan]

In addition to the fuel level sender, it looks like your fuel supply and return hoses are also accessible through this access hole. If you end up with a clogged tank screen (if so equipped) or a hose gets old and goes bad, or any number of other tank access scenarios, you will be glad you left that access hole accessible. Check out the size of the tank mounting framework, not to mention the size and weight of the tank itself! You do NOT want to be forced to remove and reinstall that thing!